以下指定是否在项目指定偏移可见或不可见:
public bool IsItemVisible(ListBox listBox, int index)
{
if (listBox.Items.Count != 0)
{
VirtualizingStackPanel vsp = (VirtualizingStackPanel)VisualTreeHelper.GetParent(listBox.ItemContainerGenerator.ContainerFromIndex(0));
int FirstVisibleItem = (int)vsp.VerticalOffset, VisibleItemCount = (int)vsp.ViewportHeight;
return index >= FirstVisibleItem && index <= FirstVisibleItem + VisibleItemCount;
}
return false;
}
您可以使用它像这样:
private void Button_Click(object sender, RoutedEventArgs e)
{
for (int i = listbox1.Items.Count - 1; i >= 0; i--)
if (!IsItemVisible(listbox1, i))
((ListBoxItem)listbox1.Items[i]).Visibility = Visibility.Collapsed;
}
发布您的XAML或简体中文版。 – 2009-04-29 12:23:14